EXPLAIN THE ANSWER AND I WILL GIVE BRAINLIEST:

Answer:
I think it might be c
Explanation:
Stomata are composed of two guard cells. These cells have walls that are thicker on the inner side than on the outer side. This unequal thickening of the paired guard cells causes the stomata to open when they take up water and close when they lose water.
sorry if it's wrong
Answer: C. When the guard cells are full of water, they become stiff and hold the pore open.
Explanation: